1876.] The Cave Beetles of Kentucky. a 
there was absolutely no difference from a number of examples of 
the same species from Mammoth Cave. Eleven A. Tellkampfit 
from White’s Cave, a small cavern near the surface, did not 
differ in any respect from a number of Mammoth Cave specimens, 
both sets measuring 0.30 inch. Fourteen A. Tellkampfii col- 
lected by Mr. Sanborn in Sugar Bowl Cave, three miles north- 
west of Glasgow Junction, were the same as those from Mammoth 
Cave, but among them was some variation in size ; the longest 
individual was 0.30.inch, the shortest 0.25 inch. Out of sixty- 
five A. Tellkamp fii collected by Mr. Sanborn in Long Cave, 
nearly one mile from daylight, the longest was 0.30 and the 
shortest was 0.25 inch. Out of twenty-seven specimens of A. 
Telikampfii from one locality in Mammoth Cave, the Labyrinth, 
the amount of variation was exceedingly slight, none being over 
0.30 inch and the smallest 0.27 inch in length. 
The smaller species of Anophthalmus seem to vary more than 
Lelikamp fii, probably owing to the fact that the caves they occur 
in are in most cases smaller, nearer the surface, and therefore with 
a less equitable temperature and more sudden alternations of 
dampness and dryness. For example, of eighteen specimens of 
A. tenuis, the largest measured 0.20 and the smallest 0.16 inch, 
but there was less uniformity in size among these than in A. 
Telikamp fii from Mammoth Cave, for nearly a third were smaller 
than the others, while out of about eighteen A. Tellkampfii only 
one or two were dwarfed. Individuals of Anophthalmus Mene- 
triesi (also a smaller species than Tellkampfii) from different 
caves, varied somewhat in size. The Adelops hirtus varies more in 
Proportion than the species of Anophthalmus ; thus of twenty- 
two examples all taken from the Labyrinth, the largest were 0.12 
inch long, and the smallest 0.09 inch. Of this species two thirds - 
were males. It appears, then, that there is a slight variation in 
‘ize, and the main factor in bringing it about seems rather to be 
the want of sufficient food than any other cause. The tendency 
of variation is to a diminution of size, and this is generally among 
macta, where the climate is not extreme, owing to lack of suffi- 
pen lood.. And-to the wanderer: in- Aboot great grottoes the 
- thought constantly presents itself to the mind, How do these in- 
Sects, few and scattered as they are, get enough to live on? The 
Perpetual hunger they must undergo was well illustrated in 
Wyandotte Cave, where, on kneeling in the path, one could see 
numbers of the common myriopod of that cave (Scoterpes cav- 
ernarum Cope) gathered around the hardened drops of tallow 
